Date   

Re: Online Ham Technician Class

Howard E. Mahran / WA1HEM
 

Count me in

Excuse my typos - sent via my thumbs or by voice from a mobile device

On Apr 5, 2020, at 9:26 PM, Irvina Mizell <irvina.mizell@...> wrote:


Hey Folks,

At the online SnoVARC meeting last week we discussed the possibility of running a Technician level online class.  We have 20 students who jumped at the chance.

Next step is to find folks like you to be mentors.  Then on some scheduled basis, mentors will be available to answer questions, provide insight, and understanding.  Each student will be asked to sign up and use hamtestonline.com. 

I need mentors who will help with this.  Please let me know if you are interested, and how you could help.

Tests will be administered after the quarantine.

Thanks!

Irvina
W7IRM




--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************


Re: Online Ham Technician Class

Paul Butzi (W7PFB)
 

I’d be happy to participate in this.

-p W7PFB
73, Don’t forget to smile and have fun!

On Apr 5, 2020, at 9:26 PM, Irvina Mizell <irvina.mizell@...> wrote:

Hey Folks,

At the online SnoVARC meeting last week we discussed the possibility of running a Technician level online class.  We have 20 students who jumped at the chance.

Next step is to find folks like you to be mentors.  Then on some scheduled basis, mentors will be available to answer questions, provide insight, and understanding.  Each student will be asked to sign up and use hamtestonline.com 

I need mentors who will help with this.  Please let me know if you are interested, and how you could help.

Tests will be administered after the quarantine.

Thanks!

Irvina
W7IRM





Re: Rowlands reflector question

Jackson Beard
 

Probably 30 feet high max.


On Sun, Apr 5, 2020, 21:58 Paul Butzi (W7PFB) <w7pfb@...> wrote:
What bands do you want to cover?  And how high can you easily get an antenna (trees, etc)?

-p W7PFB
73, Don’t forget to smile and have fun!

On Apr 5, 2020, at 9:48 PM, Jackson Beard <macleanofduart@...> wrote:

Focus is on ease, not price.

On Sun, Apr 5, 2020, 21:28 Rowland <rowland.brasch@...> wrote:
How much do you want to spend? There are G5RVs, Off center fed dipoles, end feed zeps, certified and so on

On Sun, Apr 5, 2020 at 7:43 PM Jackson Beard <macleanofduart@...> wrote:
100 x 270 about .70 acre

On Sun, Apr 5, 2020, 19:33 Rowland <rowland.brasch@...> wrote:
How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************




--
Thanks,
Rowland




--
Thanks,
Rowland




--
Thanks,
Rowland




Re: Rowlands reflector question

Paul Butzi (W7PFB)
 

What bands do you want to cover?  And how high can you easily get an antenna (trees, etc)?

-p W7PFB
73, Don’t forget to smile and have fun!

On Apr 5, 2020, at 9:48 PM, Jackson Beard <macleanofduart@...> wrote:

Focus is on ease, not price.

On Sun, Apr 5, 2020, 21:28 Rowland <rowland.brasch@...> wrote:
How much do you want to spend? There are G5RVs, Off center fed dipoles, end feed zeps, certified and so on

On Sun, Apr 5, 2020 at 7:43 PM Jackson Beard <macleanofduart@...> wrote:
100 x 270 about .70 acre

On Sun, Apr 5, 2020, 19:33 Rowland <rowland.brasch@...> wrote:
How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************




--
Thanks,
Rowland




--
Thanks,
Rowland




--
Thanks,
Rowland




Re: Rowlands reflector question

Jackson Beard
 

Focus is on ease, not price.


On Sun, Apr 5, 2020, 21:28 Rowland <rowland.brasch@...> wrote:
How much do you want to spend? There are G5RVs, Off center fed dipoles, end feed zeps, certified and so on

On Sun, Apr 5, 2020 at 7:43 PM Jackson Beard <macleanofduart@...> wrote:
100 x 270 about .70 acre

On Sun, Apr 5, 2020, 19:33 Rowland <rowland.brasch@...> wrote:
How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland

--
Thanks,
Rowland

--
Thanks,
Rowland


Re: Online Ham Technician Class

Jason Frazier
 

I can help.


-------- Original message --------
From: Irvina Mizell <irvina.mizell@...>
Date: 4/5/20 21:26 (GMT-08:00)
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Online Ham Technician Class

Hey Folks,

At the online SnoVARC meeting last week we discussed the possibility of running a Technician level online class.  We have 20 students who jumped at the chance.

Next step is to find folks like you to be mentors.  Then on some scheduled basis, mentors will be available to answer questions, provide insight, and understanding.  Each student will be asked to sign up and use hamtestonline.com. 

I need mentors who will help with this.  Please let me know if you are interested, and how you could help.

Tests will be administered after the quarantine.

Thanks!

Irvina
W7IRM




Re: Online Ham Technician Class

GARY DENSOW
 

I used this for all my test study and preparation.  It is very good at working with weak spots with quizzes that drill on those areas. Good references to supplemental materials.  

Gary Densow


425-281-2287

garydensow@...


From: snovarc@snovarc.groups.io <snovarc@snovarc.groups.io> on behalf of Irvina Mizell <irvina.mizell@...>
Sent: Sunday, April 5, 2020 9:26 PM
To: snovarc@snovarc.groups.io <snovarc@snovarc.groups.io>
Subject: [SnoVARC] Online Ham Technician Class
 
Hey Folks,

At the online SnoVARC meeting last week we discussed the possibility of running a Technician level online class.  We have 20 students who jumped at the chance.

Next step is to find folks like you to be mentors.  Then on some scheduled basis, mentors will be available to answer questions, provide insight, and understanding.  Each student will be asked to sign up and use hamtestonline.com. 

I need mentors who will help with this.  Please let me know if you are interested, and how you could help.

Tests will be administered after the quarantine.

Thanks!

Irvina
W7IRM




Re: Rowlands reflector question

Rowland
 

How much do you want to spend? There are G5RVs, Off center fed dipoles, end feed zeps, certified and so on

On Sun, Apr 5, 2020 at 7:43 PM Jackson Beard <macleanofduart@...> wrote:
100 x 270 about .70 acre

On Sun, Apr 5, 2020, 19:33 Rowland <rowland.brasch@...> wrote:
How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland

--
Thanks,
Rowland

--
Thanks,
Rowland


Online Ham Technician Class

Irvina Mizell
 

Hey Folks,

At the online SnoVARC meeting last week we discussed the possibility of running a Technician level online class.  We have 20 students who jumped at the chance.

Next step is to find folks like you to be mentors.  Then on some scheduled basis, mentors will be available to answer questions, provide insight, and understanding.  Each student will be asked to sign up and use hamtestonline.com. 

I need mentors who will help with this.  Please let me know if you are interested, and how you could help.

Tests will be administered after the quarantine.

Thanks!

Irvina
W7IRM




Re: Rowlands reflector question

Jackson Beard
 

100 x 270 about .70 acre


On Sun, Apr 5, 2020, 19:33 Rowland <rowland.brasch@...> wrote:
How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland

--
Thanks,
Rowland


Re: Rowlands reflector question

Rowland
 

How much room do you have (acre)?

On Sun, Apr 5, 2020 at 6:07 PM Jackson Beard <macleanofduart@...> wrote:
Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland

--
Thanks,
Rowland


Re: Rowlands reflector question

Paul Zoba
 

90 foot tower.


On Apr 5, 2020, at 6:07 PM, Jackson Beard <macleanofduart@...> wrote:


Nope.

On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland


Re: Rowlands reflector question

Jackson Beard
 

Nope.


On Sun, Apr 5, 2020, 17:59 Rowland <rowland.brasch@...> wrote:
Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland


Re: Rowlands reflector question

Rowland
 

Do you have any neighborhood restrictions

On Sun, Apr 5, 2020 at 5:10 PM Jackson Beard <macleanofduart@...> wrote:
Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************

--
Thanks,
Rowland


Re: Rowlands reflector question

Jackson Beard
 

Since everyone is offering antenna advice, I have a perfect condition kenwood hf radio I should use this time to get working. 

What's the easiest antenna to get put u pl in short order?

On Sun, Apr 5, 2020, 17:06 Howard E. Mahran / WA1HEM <wa1hem@...> wrote:

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************


Re: Rowlands reflector question

Howard E. Mahran / WA1HEM
 

Paul,  This is clearly a  newbie question…but  I’m curious, what happens if the inverted V is an actual V? Where the  ends at 30 Ft and center is at 6ft?

 

Sent from Mail for Windows 10

 

From: Paul Butzi (W7PFB)
Sent: Saturday, April 4, 2020 10:51 AM
To: snovarc@snovarc.groups.io
Subject: [SnoVARC] Rowlands reflector question

 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.

 

 

A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

 

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.

 

 

 

-p W7PFB
73, Don’t forget to smile and have fun!

 

 


--
*************************
Howard E. Mahran
WA1HEM
(425) 864 - 5104
*************************


Rowlands reflector question

Paul Butzi (W7PFB)
 

Rowland asked if adding a reflector below his 80m OCFD would improve NVIS performance on 80m.


A bit more than a 2dBi improvement at 90 degrees.  That’s with the reflector length optimized for gain.  The modeled reflector height was .1m AGL.

The downside is that it messes up SWR somewhat.  I didn’t snap a comparison though, there are just too many installation variables to make the results meaningful.




-p W7PFB
73, Don’t forget to smile and have fun!


Re: 80m OCFD NVIS

Paul Butzi (W7PFB)
 

On Apr 3, 2020, at 11:25 AM, Rowland <@Rowland> wrote:

Right now my OCFD is about 30-40' (don't know for sure). And the ends are only about 3' off the ground.

Two questions...

1. Will adding a reflector on the ground improve my NVIS?**
Without modeling it it’s hard to know for sure but I’m guessing yes, it will improve NVIS performance on 80m and probably on 40m. But I’ll model it and we’ll see.

2. Will raising the end wires to the 15' are improve things?
Improve things for NVIS or DX? 80m is the only band of interest, or 80m - 6m?

Again I haven’t modeled it (I will, though) but I’m guessing raising the ends improves the radiation pattern. But it will probably also change SWR.


** I will not be able to have the reflector wire exactly under the OCFD due to physical ground issues but it will be close
I think as long as the reflector is the right length and more or less under the antenna it would not make much difference.


-p W7PFB
73, Don’t forget to smile and have fun!


Re: 80m OCFD NVIS

Rowland
 

Right now my OCFD is about 30-40' (don't know for sure). And the ends are only about 3' off the ground. 

Two questions...

1. Will adding a reflector on the ground improve my NVIS?**
2. Will raising the end wires to the 15' are improve things?

**  I will not be able to have the reflector wire exactly under the OCFD due to physical ground issues but it will be close


Thanks,

Rowland



On Fri, Apr 3, 2020 at 10:54 AM Paul Butzi (W7PFB) <w7pfb@...> wrote:
Last night Rowland had an excellent question about how a 135’ OCFD antenna would work for NVIS, given that he’s made plenty of DX contacts using his OCFD.

This morning I ran some simulations of a 135 foot OCFD rigged approximately the way you’d have it if you followed the instructions from Buckmaster, with feedpoint about 33 feet AGL (Above Ground Level) and the ends about 15 feet - in other words, an inverted V.

The vertical radiation pattern you get is this:



That’s not an ideal NVIS pattern because it has more gain down near the horizontal (below, say, 30 degrees elevation) than you might like, but it’s giving you 4.5 dBi straight up so it would be a pretty good NVIS performer.

Rigged with the apex of the V up about 55 feet with the same leg drop improves NVIS performance by about 3 dB.

So what do you do if you want your OCFD to offer optimal DX performance instead of NVIS on the 80m band?

Raising the inverted V so the apex is at 45 meters gets you the following vertical pattern:


That gives you about 8.5 dBi at 26 degree takeoff angle, and about -1.5 dBi at 90 degrees.  It’s far more sensitive to both local and DX noise (think thunderstorms over Connecticut) and way less sensitive to NVIS signals.  It’s also not a circular pattern in the horizontal plane - it’s not shown in that diagram but all that gain is broadside to the axis of the antenna.  So if you decide to put your OCFD up at 145 feet, you want to think about how it’s oriented N/S/E/W.




-p W7PFB
73, Don’t forget to smile and have fun!


80m OCFD NVIS

Paul Butzi (W7PFB)
 

Last night Rowland had an excellent question about how a 135’ OCFD antenna would work for NVIS, given that he’s made plenty of DX contacts using his OCFD.

This morning I ran some simulations of a 135 foot OCFD rigged approximately the way you’d have it if you followed the instructions from Buckmaster, with feedpoint about 33 feet AGL (Above Ground Level) and the ends about 15 feet - in other words, an inverted V.

The vertical radiation pattern you get is this:



That’s not an ideal NVIS pattern because it has more gain down near the horizontal (below, say, 30 degrees elevation) than you might like, but it’s giving you 4.5 dBi straight up so it would be a pretty good NVIS performer.

Rigged with the apex of the V up about 55 feet with the same leg drop improves NVIS performance by about 3 dB.

So what do you do if you want your OCFD to offer optimal DX performance instead of NVIS on the 80m band?

Raising the inverted V so the apex is at 45 meters gets you the following vertical pattern:


That gives you about 8.5 dBi at 26 degree takeoff angle, and about -1.5 dBi at 90 degrees.  It’s far more sensitive to both local and DX noise (think thunderstorms over Connecticut) and way less sensitive to NVIS signals.  It’s also not a circular pattern in the horizontal plane - it’s not shown in that diagram but all that gain is broadside to the axis of the antenna.  So if you decide to put your OCFD up at 145 feet, you want to think about how it’s oriented N/S/E/W.




-p W7PFB
73, Don’t forget to smile and have fun!